79 lines
1.8 KiB
Python
79 lines
1.8 KiB
Python
"""
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explore1.py: Script to explore the OSCON schedule feed
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>>> import json
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>>> raw_feed = json.load(open('data/osconfeed.json'))
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>>> feed = FrozenJSON(raw_feed)
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>>> len(feed.Schedule.speakers)
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357
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>>> sorted(feed.Schedule.keys())
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['conferences', 'events', 'speakers', 'venues']
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>>> for key, value in sorted(feed.Schedule.items()):
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... print(f'{len(value):3} {key}')
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...
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1 conferences
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484 events
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357 speakers
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53 venues
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>>> feed.Schedule.speakers[-1].name
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'Carina C. Zona'
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>>> talk = feed.Schedule.events[40]
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>>> type(talk)
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<class 'explore1.FrozenJSON'>
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>>> talk.name
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'There *Will* Be Bugs'
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>>> talk.speakers
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[3471, 5199]
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>>> talk.flavor
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Traceback (most recent call last):
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...
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KeyError: 'flavor'
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Handle keywords by appending a `_`.
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# tag::EXPLORE1_DEMO[]
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>>> grad = FrozenJSON({'name': 'Jim Bo', 'class': 1982})
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>>> grad.name
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'Jim Bo'
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>>> grad.class_
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1982
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# end::EXPLORE1_DEMO[]
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"""
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from collections import abc
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import keyword
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class FrozenJSON:
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"""A read-only façade for navigating a JSON-like object
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using attribute notation
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"""
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# tag::EXPLORE1[]
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def __init__(self, mapping):
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self.__data = {}
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for key, value in mapping.items():
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if keyword.iskeyword(key): # <1>
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key += '_'
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self.__data[key] = value
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# end::EXPLORE1[]
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def __getattr__(self, name):
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if hasattr(self.__data, name):
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return getattr(self.__data, name)
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else:
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return FrozenJSON.build(self.__data[name])
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@classmethod
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def build(cls, obj):
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if isinstance(obj, abc.Mapping):
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return cls(obj)
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elif isinstance(obj, abc.MutableSequence):
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return [cls.build(item) for item in obj]
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else: # <8>
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return obj
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